You speak a dialect of Thri-Kreen spoken by other Arachnae's, you are fluent in it.

You also speak either Common or Undercommon.

+ 1 to Dexterity

+1 to Intelligence

You can see in the dark 60ft ahead of you in black and white.

Can walk just about any surface except magically slick surfaces at normal speed. Including ceilings and walls.

During long rests you can create structures with your silk like a cocoons or webs or turn them into ropes.

You can use the Web spell as an action without consuming any spell slot.
It has one charge and can be restored with a long rest.

As an arachnae you possess and extra head.
Allows you to bite as an action.
Give you advantage on perception check due to having a spider head as an extra head.

You have resistance to poison.